I was asked to make some puppy chow for my friends' two kids before I go over to NI visit this week. Funny.
I'm told that Shreddies are very much like chex. I've never had them, myself, but I guess it's worth a shot. It seems like Shreddies are made from wheat where Chex are made from either Wheat or Rice, so depending on what type of Chex you normally use(d) in the states, the taste may be a bit different.
Let me know how it goes if you make them, though!
--Brittany